Zaporizhzhia (U-01) (Ukrainian: Запоріжжя) is a project 641 (Foxtrot-class) diesel-electric powered submarine, and was the only submarine of the Ukrainian Navy up until her seizure in March 2014 by Russian forces during 2014 Russian annexation of Crimea. She formerly carried the Soviet Navy pennant number B-435. Zaporizhzhia was designed at the Rubin Design Bureau (Saint Petersburg). Zaporizhzhia had a crew of 78, commanded by 1st Rank Capt. Oleh Orlov. The submarine was operated by a reserve unit, having not yet returned to front line duty after her 'refurbishment'.